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Share-Based Compensation - Other Award Types (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (up to) 4 years    
Cash-Settled Award      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based liabilities paid $ 9 $ 6 $ 2
Number of share-equivalents issued (in shares) 40,166 17,207 20,393
Cash-Settled Award | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (up to) 4 years